<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>实验</title>
</head>
<body>
    <div>
        <table border="1px" align="center" width="40%">
            <tr align="center">
                <td>y</td>
                <td>y</td>
                <td>n</td>
            </tr>
        </table>
    </div>
</body>
</html>